someone who is chronically caught up in some intellectual problem or another. a cerebral person. a person that makes full use of their frontal lobes. a very smart person who may at times become oblivious to their physical self, and or surroundings because they are so caught up in thinking about mentally challenging concepts or puzzles.

person 1: i see jaques put his shoes on the wrong feet again.

person 2: yeah he's been so caught up in figuring out the unified field theory, it's surprising he remembers to eat.